cleanup: remove dead code and duplicate docs

- Remove session-ses_2f27.md (161KB raw session log)
- Remove 49 ROOT_* duplicate files across REFERENCE/
- Remove 14 duplicate files between REFERENCE/ root and history/
- Remove asr_legacy.rs (dead code, replaced by asr.rs)
- Remove src/core/worker/ (duplicate JobWorker)
- Remove src/core/layers/ (empty directory)
- Remove 4 .bak files in src/
- Remove 7 dead private methods in worker/processor.rs
- Remove backup directory from git tracking

scripts/lip_processor_simple.py

@@ -10,7 +10,6 @@ import argparse
 import os
 import signal
 import cv2
-import numpy as np
 
 sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
 from redis_publisher import RedisPublisher